汽車連桿有限元分析計(jì)算

車輛工程專業(yè)畢業(yè)論文，論文編號(hào):JX927  論文字?jǐn)?shù):14606.頁數(shù):42

摘     要
 根據(jù)汽車工業(yè)年鑒相關(guān)資料統(tǒng)計(jì)分析，預(yù)計(jì)“十一五” 期間汽車將以15%左右的的速度增長，2010年汽車行業(yè)規(guī)模將達(dá)到1273萬輛以上。汽車規(guī)模的高速增長，對(duì)國內(nèi)各大汽車制造商來說既是一種機(jī)遇也是一種挑戰(zhàn)。而作為汽車的心臟----發(fā)動(dòng)機(jī)的研發(fā)更是重中之重，它代表了一個(gè)汽車制造商的生產(chǎn)實(shí)力和技術(shù)水平。發(fā)動(dòng)機(jī)由很多零件組成，其中作為傳遞動(dòng)力的第一個(gè)構(gòu)件----連桿其在發(fā)動(dòng)機(jī)中的地位尤為重要。一臺(tái)優(yōu)秀的發(fā)動(dòng)機(jī)對(duì)連桿的強(qiáng)度和硬度的要求都是很高的，這就要求研發(fā)人員對(duì)連桿進(jìn)行有效的力學(xué)分析計(jì)算。由于發(fā)動(dòng)機(jī)連桿結(jié)構(gòu)的復(fù)雜性，采用傳統(tǒng)的力學(xué)方法，只能近似的反應(yīng)其受力狀況和變形情況，遠(yuǎn)不能滿足進(jìn)一步分析的需要，而ANSYS軟件正是針對(duì)解決這一類問題設(shè)計(jì)的。它是目前最先進(jìn)的分析方法，其利用基于理論平臺(tái)的有限元技術(shù)分析、預(yù)測(cè)、評(píng)價(jià)這些關(guān)鍵零件的強(qiáng)度剛度。本文所述就是利用ANSYS軟件對(duì)連桿進(jìn)行三維建模，劃分網(wǎng)格，再施加相應(yīng)的約束，最后對(duì)連桿的小孔內(nèi)表面施加載荷，在ANSYS中進(jìn)行計(jì)算求解并分析計(jì)算結(jié)果。

關(guān) 鍵 詞：連桿 有限元 剛度 強(qiáng)度

Abstract
 According to automotive industry yearbook statistical analysis of relevant information, it is expected to be about 15 percent growth of cars during the "11th Five-Year Plan" period. In 2010, the automobile industry will reach more than 12.73 million. The rapid growth in automobile industry is an opportunity as well as a challenge to the domestic automobile manufacturers. As the heart of cars, engine is urgent to be studied. It represents the strength and technological level of an automobile manufacturer. Engine consists of many parts. Power transmission, as the first component, links in the particularly important position of the engine. The requirements to the strength and hardness of a good engine are very high, which means that the research and development personnel have to make an effective mechanics calculation to the power transmission. Because of the complexity of the power transmission structure, it can only approximately reflect its force and deformation situation by using traditional mechanical method, which can’t meet the need of further analysis. However, ANSYS software, the most advanced analysis method at present, is designed to solve this kind of problem. It makes use of the analysis, forecast, and calculation of theoretical finite element technology to the hardness and strength of some key parts. In this paper is to link ANSYS software for 3D modeling, by grid, and then impose the appropriate restraint, the last link to the keyhole on the inner surface of load, in ANSYS calculation and analysis for the results.

Keywords: Linkage, FEM, Stiffness, Strength

目  錄
中文摘要 i
英文摘要 ii
目錄 iii
第一章     緒論 1
 1.1  研究動(dòng)機(jī)與目的 1
 1.2  研究的現(xiàn)狀 3
 1.3  研究方法 4
 1.4  論文內(nèi)容概述 5
 1.5  論文課題的來源 5
第二章     有限元法和ANSYS軟件 6
 2.1  有限元法簡介 6
 2.1.1 有限元法基本概念 6
 2.1.2 有限元法的一般程序結(jié)構(gòu) 7
 2.1.3 有限元法的發(fā)展趨勢(shì) 8
2.2   有限元分析軟件ANSYS 9
 2.2.1 ANSYS的功能 9
 2.2.1.1 前處理模塊PREP7 10
 2.2.1.2 分析計(jì)算模塊 10
 2.2.1.3 后處理模塊POST1和POST2 12
 2.2.2 ANSYS軟件的結(jié)構(gòu) 12
第三章     連桿的有限元分析 13
 3.1  引言 13
 3.2  連桿計(jì)算工況及載荷確定 13
 3.2.1 連桿的組成 13
 3.2.2 連桿運(yùn)動(dòng)情況分析 14
 3.2.3 計(jì)算工況及載荷確定 14
 3.3  建立連桿模型 16
 3.3.1 定義工作文件名和工作標(biāo)題 17
 3.3.2 定義單元類型及材料屬性 17
 3.3.3 建立2D模型 17
 3.3.4 創(chuàng)建兩個(gè)矩形面 18
 3.3.5 生成一個(gè)新的面 19
 3.3.6 生成2D網(wǎng)格 21
 3.3.7 采用拖動(dòng)生成3D網(wǎng)格 22
 3.4  連桿的分析計(jì)算 23
 3.4.1 施加約束 23
 3.4.2 施加載荷 24
 3.4.3 計(jì)算求解 24
 3.5  瀏覽分析結(jié)果 24
 3.6  分析計(jì)算結(jié)果 26
 3.6.1 變形分析 26
 3.6.2 應(yīng)力分析 27
第四章     總結(jié) 29
參考文獻(xiàn) 30
致謝 31
附錄A 命令流 32
附錄B 連桿建模分析過程圖 35